"female genitals, especially with a display of pubic hair," by 1927, British slang, ultimately from beaver (n.1), perhaps transferred from earlier meaning "a bearded man" (1910), or directly from the appearance of split beaver pelts.
"studied display, artificiality of manner or conduct," 1540s, from French affectation (16c.) or directly from Latin affectationem (nominative affectatio) "a striving after, a claiming," noun of action from past-participle stem of affectare "to strive for" (see affect (v.2)).
early 15c., pomposite, "solemnity" (a sense now obsolete), from Medieval Latin pompositas, from Late Latin pomposus "stately, pompous" (see pompous). The sense of "ostentatious display," usually objectionable, is from 1610s in English; earlier in French pomposité.